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4 Sheets-Sheet 2.

(No Model.)

G. A. BARTH. STEAM AGTUATED VALVE.

Patented Mar. 5, 1889.

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4 Sheets-Sheet 4.

(No Model.)

G. A. BARTH. STEAM AGTUATBD VALVE.

No. 398,930. Patented Mar. 5, 1889.

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UNITED STATES ATnNT @ritieni GUSTAY A. BARTH, OF ST. LOUIS, MISSOUR,ASSIGNOR '.l() PIERRE CHTEAU, OF SAME PLACE.

STEAM luffi-CTTUNID VALVE.

SPECFICATION forming part of Letters Patent No. 398,936, dated March 5,1889.

Application tiled November 19, 1888. Serial No. 291,264. (No model.)

Ywhich the following' is a fulhclear, and exactdescription.

My invent-ion relates to improvements in steam and other' motive powerengines Wherein the piston is reeiproeated in the cylinder i by theaction of its valve without the intervention of \f'al\'e-cperatingmechanism, and has for its object to obtain a uniform pressure on bothsides of the piston and to simplify the arrangement ot' the parts.

My invention comprises a cylinder having combined inlet and exhaustportsand passages to and from a steam-chest containing a slide ordistrilnition valve and provided with inlet and exhaust ports, a piston'fitted within the cyl i nder and having a rod Working through a tubularproieetion on the cylinder-cover, separate relief passages opening fromthe tubular projection into the stea1n-cl1est behind the ends ot' thedistribation-Valve, with corresponding' passages in the piston -rodopening', respectively, from each side ot the piston, the wholeoperating to hold and reverse the distribution-valve at. the propertimes and thereby control the admission and exhaust of steam or othermotive fluid to and from each side of the piston alternately.

7 spectively, in Fig. 6, like letters of reference denoting like partsin the respective gures.

Referring to Figs` l to 5, o. represents a cylinder having combinedinlet and exhaust ports and passa-ges b o', opening, respectively, fromthe rear and front end of the cylinder u into a steam-chest, e, which isprovided with an inlet-port, d, and exhaust-ports e e.

lithiu the steam-chest c is fitted a slide or distrilnition valve, jf,preferaliily circular in form, and having three circumferential groovesor passages, .r/'g g2, which extend entirely around the valref, thepassage g commanding the inlet ports and passages d Z) and d balternately, passage g commanding the outlet passage and port h e andthe passage g2 eonnnainling the outlet passage and port Zi e during theoperation of the valvef, as hereinafter more particularly described.

/1 represents the piston 'fitted within the cyl-y inderu and haring arod, i, which passes steanltight through a tubed, projecting' from thecover at. one end ot the `cylinder d and provided at its outer end witha stuffing-bmj'.

From the interior of the tube near the l stuffing-benj', a passage,extends through the Wall of the tube j and that oli' the cylinder u.tothe rearend ot' the steam-chest. c, into which it opens behind thedistribuitioir-valve f, a similar passage, Z, opening from the cylinderend of the tube j into the steam-chest.

c behind the opposite or front end of the dis- 5 tribution-valvef.

On the accompanying drawings, Figure l represents a central longitudinalsection of my improved steam or other motive-power engine. the pistonbeing shown at the rear end ot' its stroke in the cylinder; Fig. 2, al

similar View thereof with the pistou at the front end of its stroke;Fig. 3, a longitudinal section on line l l in Fig. Q, and Figs. l and 15 transverse sections on lines 2 2 and 3, re- 1 specti'vely, in Fig. 1.Figs. 6 and T are similar Yiews to Figs. l and '2, respectively, of myintention as applied to a direct-acting steanr i i i l l l Formedlongitudinally through the pistonrod 2 is a passage, L", which opensfrom the cylinder' o at the rear side of its piston 7i, into the tubejfor communicating' with the reliefpassage 1.1, and in the circumferenceof the piston-rod i, at the front side of the piston 7l, is a groove orpassage, Z', for communicating with the relief-passage Z, ashereinafter' more particularly referred to.

As seen in Fig. Lthe piston h is at the rear end of its stroke in thecylindera, and the slide or distribution faire f at the correspondingend of the steam-chest c, so that its passages g Q2 'estaldishcommunication bet-Ween the inlet-port d land passage b and between theoutlet-passage ZJ and port e', whereby steam or other motive fluidpasses from the inletport d through the passage Zi inte the cyliudgr IOOa on the rear side of the piston ZL, which is thereby forced to t-hefront end of the cylinder a until the opening of the relief-passage Zain the piston-rodi farthest from the piston h comes opposite to theopening of the passage k in the tube j, (see Figs. 2 and 3,) and soallows the steam from the rear side of the piston ZL to pass into thesteam-chest c behind the rear end of the distribution-valve f, Which isthereby thrown over or reversed in the steanrchest c, so that itspassage g opens communication between the inlet-port CZ and passage ZJ',and its passage g opens communication between the outlet-passage Z9 andport e, when steam entering the cylinder a on the front side of thepiston Z1, and exhausting from its rear side will force the piston h t0-ward the rear end of the cylinder av until approaching the terminationof its stroke, when the groove Z emerges from the tube j into thecylinder a and allows the steam to pass from the latter (see Figs. l and4) through the re-v lief-passage Z into the steam-chest c at the frontend of the distrilmtion-valve j', which is thereby forced to the rearend of the steamchest c, as seen in Fig. l, and the operation repeated.

'ln the application of my invention to a direct-acting mining-engine, asshown. in Figs. (i to ll, the relief-passage Zt" isforraed through thepiston-rod i', which reciprocates within the tube j, and is reduced indiameter where 'it passes through the stuffing-box'jz, so as to form ashoulder thercat For cushioning the piston Z1..

To shorten the stroke of the piston ZL., I may form in the circumferenceof the piston-rod li a second (or more) groove, Z2, which is located ata suitable distance rearward from the groove Z, lfor establishingcommunication between the cylinder a on the front side of the piston hand the steam-chest c at the front end of the distributionvalve f at anearlier period ot' the rear stroke of the piston ZL than occurs with thegroove Z the groove Z'2 opening into an independentbranch of therelief-passage Z, so that it may be closed by a cock or valve, on, whenit is desired that the groove Z alone shall make communication with thesteam-chest c for obtaining the full stroke of the piston h.

l claim- 1. The combination of a cylinder, a, having combined inlet andexhaust ports and passages b b', a steam-chest, c, having inlet-port CZand exhaust-ports e e', a slide or distribution valve, f, located insteam-chest c, and formed with circumferential depressions or passages gg g?, a piston, h, fitted within the cylinder a, and provided with arod, z', passing through a tube, j, relief-passages Zo and Z, openingfrom the tube j into the steam-chest c behind the respective ends of thedistribution-valve f, with corresponding passage Za and groove Zformedin the piston-rod Z, substantially as shown, and for the purposedescribed.

2. In a directacting steam or other motive power engine, the combinationof a cylinder,

ct, having combined linlet and exhaust ports and passages b Z2', asteam-chest, c, having inlet-port d and exhaust-ports ee', a slide ordistribution valve, f, located Within steamchest c, and formed withcircumferential depressions or passages g g g2, a piston, h, littedwithin the cylinder a, and provided with a rod, i', passing through atube, j, relief-passages k and Z, opening from the tube j into thesteam-chest c behind the respective ends of the distribution-valve f,said passages Z having a cock or valve, m, with a corresponding passage,7o.', and grooves Z Z2 formed in the pistonrod ,.substantially as shown,and for the purpose described. Y

In testimonywhereof I affix my signature, in presence of two Witnesses,this 15th day of N o'- vember, 1888.

eUsTAv A. BARTH?.

Witnesses: l

S. L. SCHRADER, PAUL BAK-EWELL.

